For some 12 months we have mostly had a broadband line speed of 1.5Mbps. with the expected download speed of 1.2Mbps being typically obtained.
In recent months there have been several instances whereby the reported S/N slowly drops to less than 3 (target S/N =6) with a dramatic increase in the rate of CRC error production ( Latency type =fast). Download speeds of less than 0.1Mbps would then result.
Despite the indicated low S/N simply initiating a "resynch" by disconnecting the broadband cable from the faceplate for a few seconds results in essentially the original line speed being retained - but with the reported S/N going back to the expected 6 and the CRC error rate returning to an acceptable rate. ( error rate 1/1000th of that prior to resynch)
Does this indicate that the HomeHub3 is faulty?
1) In the fault condition , using “Routerstats” , I can see that the errors are accumulated at an almost constant rate. (i.e. the noise is not stochastic in nature)
2) The Latency type has now been set to “Interleaved” and download speeds are less affected by the above problem as most of the errors are handled by FEC .
FEC errors 75,000/second
CRC errors 100/second
if your noise margin is being lowered to 3db by DLM then that would normally suggest a good stable connection and the lowering of noise margin should give a bit more conenction speed. however in some instances the lowering to 3db causes problems especially in the evening/night and download speed suffers due to increase in errors
the mods have helped solve the problem by putiing noise margin back to 6db with slight drop in conenction speed
I believe the target S/N is staying constant at 6dB - but that the HH3 is reporting that the Noise Margin is decreasing to 3dB as the noise on the line has increased
can you try quiet line test dial 17070 option 2 should be quiet and best with corded phone
if your noise margin is dropping to 3db does it return to 6db the next day without any reset?
I think depending on your reply it would be better moving your thread to the adsl board
Telephone line is clear as a "Bell"
Once the noise margin has dropped below 3dB it does not recover ( not even after 2 days) - but a "resynch" always works
so can you clarify
when noise margin reduces to 3db then dos it drop lower in the evening then recover the next day to 3db - suggesting the new normal for your line set by DLM is 3db